Why use node

Why use node

var http = require('http');

http.createServer(function handleReq(req, res) {
    res.end('hello world');
}).listen(8080);

Why use node

var TChannel = require('tchannel');

TChannel()
    .register('hello', function handleReq(res, res) {
        res.sendOk(null, 'hello world');
    })
    .listen(8080, '127.0.0.1')

Why use node

• Great for networking glue
• Great for distributed stateful programs
• Pretty damn fast
• First class support for monitoring+debugging

Node services at uber

• Use `uber-standard` for linting
• Use `npm run shrinkwrap` to update deps
• Use `node server.js` to start services
• Use `node test/index.js` to run tests

Node services at uber

Use `zero-config` to load config files

var ZeroConfig = require('zero-config');

var config = ZeroConfig(__dirname, {
    dc: '/etc/uber/datacenter'
});

config.get('clients.ringpop.bootstrapFile')
config.get('port')

Node services at uber

Use `uber-statsd-client` for monitoring

var Statsd = require('uber-statsd-client');

var statsd = Statsd({ host: 'localhost', port: 5555 });

statsd.increment('my-app.database-connection-died');
statsd.increment('my-app.no-drivers-available');

Node services at uber

Use `*-logtron` for logging

var Logtron = require('logtron');

var logger = Logtron({ meta: {
    team: 'my-team',
    project: 'my-app'
} });

logger.error('unexpected failure in fetching city', {
    err: err,
    cityId: cityId,
    cityName: cityName
});

logger.warn('Got a bad response for city request', {
    response: buffer.toString().slice(0, 50),
    cityId: cityId,
    cityName: cityName
});

Cool shit you can do in node

Ringpop

• Consistent hash ring for a cluster
• Trivial leader election
• In memory queues
• In memory locks

TChannel

• Supports structure RPC with thrift
• Can do bidirectional p2p communication
• Supports multiplexing streaming

node-stap and mdb

• Deep system level debugging
• Insight into actual production performance
• See exactly what went wrong in production